[R] aggregate() - error message

2009-09-24 Thread Juliane Struve
Dear list,   would anybody be able to tell me why the statement   Tripstatistics=aggregate(TripsData[2:3],by=list(Trip=Tripmatch),FUN=mean)   seems to work well with TripsData 1 but not with TripsData 2 ?   With TripsData 2 it yields   Error in FUN(X[[1L]], ...) : arguments must have same length

Re: [R] aggregate() - error message

2009-09-24 Thread Paul Emberson
Hi, Are you trying to get columns 2 and 3 from TripsData in which case you need to say TripsData[,2:3] ? Paul Juliane Struve wrote: Dear list, would anybody be able to tell me why the statement Tripstatistics=aggregate(TripsData[2:3],by=list(Trip=Tripmatch),FUN=mean) seems to work

Re: [R] aggregate() - error message

2009-09-24 Thread Jorge Ivan Velez
Hi Juliane, Try TripsData[, 2:3] instead of TripsData[ 2:3 ] in the aggregate call. HTH, Jorge On Thu, Sep 24, 2009 at 6:52 AM, Juliane Struve wrote: Dear list, would anybody be able to tell me why the statement Tripstatistics=aggregate(TripsData[2:3],by=list(Trip=Tripmatch),FUN=mean)

Re: [R] aggregate() - error message

2009-09-24 Thread Juliane Struve
:00 Subject: Re: [R] aggregate() - error message Hi, Are you trying to get columns 2 and 3 from TripsData in which case you need to say TripsData[,2:3] ? Paul Juliane Struve wrote: Dear list,   would anybody be able to tell me why the statement  Tripstatistics=aggregate(TripsData[2:3],by=list

Re: [R] aggregate() - error message

2009-09-24 Thread Juliane Struve
From: Jorge Ivan Velez jorgeivanve...@gmail.com Cc: R mailing list r-help@r-project.org Sent: Thursday, 24 September, 2009 13:32:59 Subject: Re: [R] aggregate() - error message Hi Julien, Works for me: # Data sets TripsData1 - read.table(textConnection(Trip